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Do you mean you want a different person listed for the first checkbox?

Regarding title of your post: the following should put a unique number within each array cell. Note that it continues to generate random numbers until the array is filled. And if the random number is already in the array, it simply generates a new one. (I fiddled this from one of the script/tutorials at my site -- "AD&D Character Generation" -- so it may have a bug or two (god forbid!)